Supervillain teams

Villains should be treated with the same respect by writers as heroes, if the villain is actually stronger than the hero, than maybe the villain should win, villains have the advantage of not holding back and for many of them when they when they kill the heroes.

Black Adam family
They have their own country in the middle east - Black Adam is harsh but fair.

Hellfire Club
Illuminati like organization, difficult to destroy as it is technically legitimate and even if some of its members do happen to get caught doing something this won't destroy the whole group.